Multiple stage fuel pump

Patent metadata

Field	Value
Publication number	US-2016123288-A1
Application number	US-201514930312-A
Country	US
Kind code	A1
Filing date	Nov 2, 2015
Priority date	Nov 3, 2014
Publication date	May 5, 2016
Grant date	—

Abstract

A multi-stage fuel pump includes a casing having a fuel intake formed on one side thereof and a fuel discharge port formed on the other side thereof, and a plurality of impellers provided within the casing, having a plurality of blades disposed on a circumferential surface in an outward direction of the circumferential surface and having blade chambers formed between the blades and penetrating through upper and lower surfaces of the impellers to allow fuel to be discharged and introduced to and from upper and lower sides of the blades, and formed in multiple stages, wherein fuel intaken through the fuel intake according to rotation of the impellers is discharged to the fuel discharge port through the blade chambers of the impellers, and the numbers of the blades of each of the impellers are different, thereby reducing blade passage frequency (BPF) noise generated according to rotation of the impellers.

First claim

1 . A multi-stage fuel pump comprising:
a casing having a fuel intake formed on one side thereof and a fuel discharge port formed on the other side thereof; and a plurality of impellers provided within the casing, having a plurality of blades disposed on a circumferential surface in an outward direction of the circumferential surface and having blade chambers formed between the blades and penetrating through upper and lower surfaces of the impellers to allow fuel to be discharged and introduced to and from upper and lower sides of the blades, and formed in multiple stages, wherein a flow channel is formed such that fuel intaken through the fuel intake according to rotation of the impellers is discharged to the fuel discharge port through the blade chambers of the impellers, and the numbers of the blades of each of the impellers are different.

2 . The multi-stage fuel pump of claim 1 , wherein the impellers are formed to have different outer diameters and have different numbers of blades, or are formed to have the same outer diameter and have different numbers of blades.

3 . The multi-stage fuel pump of claim 1 , wherein the fuel intake is connected to a fuel inlet side of one impeller, the fuel discharge port is connected to a fuel outlet side of another impeller, and a serial connection flow channel connecting the fuel outlet sides and the fuel inlet sides of the impellers is formed in the casing.

4 . The multi-stage fuel pump of claim 1 , wherein the fuel intake is connected to each of fuel inlet sides of the impellers and the fuel discharge port is connected to each of fuel outlet sides of the impellers.

5 . The multi-stage fuel pump of claim 1 , wherein the casing comprises:
an upper casing having an upper flow channel recess formed on a lower surface thereof and allowing fuel to flow therein and the fuel discharge port connected to the upper flow channel recess and allowing fuel to be discharged by penetrating through upper and lower surfaces thereof; an intermediate casing coupled to a lower side of the upper casing having an intermediate upper flow channel recess formed on an upper surface thereof and allowing fuel to flow therein and an intermediate lower flow channel recess formed on a lower surface thereof and allowing fuel to flow therein; and a lower casing coupled to a lower side of the intermediate casing and having a lower flow channel recess formed on an upper surface thereof and allowing fuel to flow therein and the fuel intake connected to the lower flow channel recess and allowing fuel to flow by penetrating through upper and lower surfaces thereof, wherein the impellers are provided in a space between the upper casing and the intermediate casing and a space between the intermediate casing and the lower casing, respectively.

6 . The multi-stage fuel pump of claim 5 , wherein an intake flow channel is formed in the intermediate casing such that a fuel inlet side and the fuel intake of another impeller are connected through a fuel inlet side of one impeller, or the intake flow channel is formed in the intermediate casing and the lower casing such that the fuel inlet side and the fuel intake of another impeller are connected without passing through the fuel inlet side of one impeller, and
a discharge flow channel is formed in the upper casing and the intermediate casing such that each of fuel outlet sides of the impellers is connected to the fuel discharge port.

7 . The multi-stage fuel pump of claim 5 , wherein a serial connection flow channel connecting a fuel outlet side of one impeller and a fuel inlet side of another impeller is formed in the intermediate casing.

Assignees

• Coavis

Inventors

• Yu Gyu Sang
• Choi Won Young
• Sohn In Seok

Classifications

• F05D2250/53

  of regenerative pumps · CPC title

• F04D29/669

  especially adapted for liquid pumps (F04D29/18 takes precedence) · CPC title

• F04D15/0005

  by using valves · CPC title

• F04D13/0653

  the motor being flooded · CPC title

• F04D5/007

  Details of the inlet or outlet · CPC title